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How to check whether your ubuntu is 64 bit

I recently started playing with docker and their prerequisite states that your ubuntu must be 64 bits. Here's the command that helps you find the number of bits for your ubuntu

uname -a
On my 64 bit ubuntu, I got the following output
Linux username 3.13.0-62-generic #102-Ubuntu SMP Tue Aug 11 14:29:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux